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In the late season, the hybrid rice is divided into seedlings in the early stage, and the high-yield can be achieved by the large grain weight in the later stage. Therefore, the principle of “before and after heavy, intermediate control†should be adopted for fertilization, and the “30-day black, 40-day light green, 50 green "The seedling looks." Black refers to dark green leaves, which is a high chlorophyll content, the rapid growth of leaves and alfalfa; light green is the performance of stem and leaf fiber tissue development; green is the performance of stem and leaf weight gain.
“Pre-emphasis†refers to the topdressing and base fertilizer amount in the early stage (before insertion and differentiation of young spikes) accounted for 70-80% of the total fertilization amount in the whole season. First, the base fertilizer is applied. The base fertilizer is generally applied to 25-30 tons of animal manure per acre, 30-35 kg of ammonium bicarbonate, 20-25 kg of superphosphate, and 10-12.5 kg of potassium chloride. The second is to timely fill the fertilizer. The first top dressing was carried out 7-8 days after the insertion of the seedlings began to return to the green, generally 5-7.5 kg of urea per acre. The second top dressing is carried out about 15 days after the insertion, and generally 25-30 tons of animal manure per acre. The purpose of these two top dressings is to strive for a maximum of 200,000 mu per mu during this period, of which the effective number of panicles reaches 180,000 to 200,000 per mu.
"Intermediate control" refers to the mid-term (from the beginning of young panicle differentiation to the fifth stage of young panicle development), generally no top dressing, only for the poor growth of the second and third types of grass to apply some fertilizer. In the medium-term water control and fertilizer production, the exposed field is conducive to the stable growth and stability of the seedlings, so that the leaves turn to pale green after 40 days of insertion, so that the root group is developed deep and deep, the stems are thick and the leaves are short and thick.
“Post-weight†refers to the application of tail fertilizer (also known as ear fertilizer or attack fertilizer). The time and quantity of fertilization depends mainly on the growth of the seedlings. The seedlings do not turn light green, but may or may not be fertilized. When the flag leaves are half-drawn, the premature aging of the seedlings should be re-applied to promote the development of new roots, prolong the life of the last three functional leaves, and make the seedlings of the seedlings increase the seed setting rate. Generally, 4-5 kg ​​of urea is applied per mu, 10-15 kg of superphosphate, and 5-7.5 kg of potassium chloride. In the large fetus (the eighth stage of young ear development) and the filling stage, the foliar fertilizer is sprayed, generally 0.1 kg of potassium dihydrogen phosphate or urea, 0.5 kg of superphosphate and potassium chloride, and 75 kg of spray. . Spray once every 5-7 days for 2-3 consecutive times.
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Fertilization of hybrid rice in late season
In the early stage of the late season, the temperature is high and humid, and the low temperature is dry in the late stage. If the hybrid rice is improperly fertilized, the disease is serious, and the increase of empty mites causes the yield to decrease. In order to capture the high yield of hybrid rice in the late season, the fertilization techniques are as follows:
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